Reinforced concrete prefabricated column, prefabricated column and cast-in-place beam connecting joint and construction method

Abstract

The invention discloses a reinforced concrete prefabricated column, a prefabricated column and cast-in-place beam connecting node and a construction method, one end of a prefabricated column main body is provided with a longitudinal exposed reinforcing steel bar (with a threaded structure), the other end of the prefabricated column main body is provided with a supporting sleeve and a reinforcing steel bar connector, and a beam plate structure is provided with a positioning sleeve; the supporting sleeve is matched with the positioning sleeve (having the double functions of precise positioning and temporary supporting), the steel bar connector is matched with the longitudinally exposed steel bar with the threaded structure, and the integrated solution of supporting, positioning and connecting is achieved.

Description

Technical Field

[0001] The invention relates to a beam-column connection node structure, in particular to a reinforced concrete prefabricated column, a connection node between a prefabricated column and a cast-in-place beam, and a construction method. Background Art

[0002] With the rapid development of building industrialization, the application of prefabricated components in construction is becoming increasingly widespread. Among them, the connection nodes between reinforced concrete prefabricated columns and cast-in-place beams have become the key technology of prefabricated buildings. Their performance directly affects the stability of the overall structure and construction efficiency. The traditional node structure and connection method are: the node area is cast in place, and the upper and lower column reinforcements are connected by sleeve grouting. This connection method has the disadvantages of inaccurate reinforcement positioning and difficulty in connection, which affects the safety of the structure. There is also a method of prefabricating the node area, which has the disadvantages of complex beam reinforcement connection and cumbersome construction. The existing node structure and construction methods are difficult to meet the development needs of building industrialization. The existing technology has the following disadvantages: 1) The upper and lower connection nodes of prefabricated columns usually require reserved steel bars, grouting sleeves or bolt holes, etc. The node structure is complex and requires high construction precision.

[0003] 2) The seismic performance of the upper and lower connection nodes of precast columns is usually not as good as that of cast-in-place nodes. Especially under strong earthquakes, stress concentration is prone to occur in the column root area, leading to cracking or damage.

[0004] 3) The upper and lower connections of prefabricated columns are often made by grouting sleeve connection, but problems such as loose grouting material, residual bubbles or insufficient strength of grouting material are prone to occur during the grouting process.

[0005] 4) The upper and lower connections of prefabricated columns require the reserved steel bars of the upper and lower columns to be precisely aligned, but due to manufacturing and construction errors, steel bar misalignment or deviation is likely to occur.

[0006] 5) The upper and lower connections of prefabricated columns require multiple processes such as on-site hoisting, alignment, and grouting, and a large number of temporary supports are required for the upper columns. The construction efficiency is limited by on-site conditions and the technical level of the workers. Summary of the Invention

[0007] The object of the present invention is to provide a reinforced concrete precast column, a production mold and a connection node between the precast column and the cast-in-place beam, so as to solve the above-mentioned problems existing in the prior art.

[0008] The technical solution of the present invention is as follows: a reinforced concrete prefabricated column includes a prefabricated column body, a group of longitudinal exposed steel bars are provided at one end of the prefabricated column body, a support sleeve is provided at the other end of the prefabricated column body, and a steel bar connector that matches the longitudinal exposed steel bars is also provided at the other end of the prefabricated column body.

[0009] In the aforementioned reinforced concrete prefabricated column, a threaded structure is provided on the top of the longitudinally exposed steel bars.

[0010] In the aforementioned reinforced concrete prefabricated column, the support sleeve is located in the middle of the other end of the prefabricated column body.

[0011] In the aforementioned reinforced concrete prefabricated column, the other end of the prefabricated column body is provided with a second longitudinal exposed steel bar with a threaded structure at the end, and the thread direction of the threaded structure of the second longitudinal exposed steel bar 5 is opposite to the direction of the threaded structure of the longitudinal exposed steel bar 2, and the second longitudinal exposed steel bar is connected to the steel bar connector; or, the steel bar connector is pre-buried in the prefabricated column body and connected to the longitudinal steel bar located inside the prefabricated column body.

[0012] The connection node between the prefabricated column and the cast-in-place beam includes two prefabricated columns distributed up and down, and a cast-in-place beam and a connecting column section are arranged between the two prefabricated columns from bottom to top. The prefabricated columns adopt the aforementioned reinforced concrete prefabricated columns; the longitudinal exposed steel bars of the prefabricated column located below pass through the cast-in-place beam and are exposed above the cast-in-place beam, and a positioning sleeve is provided in the middle of the upper surface of the cast-in-place beam; the steel bar connector at the bottom of the prefabricated column located above is connected to the longitudinal exposed steel bars on the prefabricated column below, and the supporting sleeve is matched with the positioning sleeve; the connecting column section includes a concrete layer, and column stirrups are provided in the concrete layer at the steel bar connector.

[0013] In the aforementioned connection node between the prefabricated column and the cast-in-place beam, an integrated positioner is used for auxiliary installation during the installation of the positioning sleeve; the integrated positioner includes a mounting base plate, a central mounting hole sleeve is provided in the middle of the mounting base plate, and a circle of longitudinal reinforcement positioning kits corresponding to the position of the longitudinal exposed steel bars or the second longitudinal exposed steel bars are also provided on the surface of the mounting base plate; the surface of the mounting base plate is also provided with a casting flow port.

[0014] In the aforementioned connection node between the prefabricated column and the cast-in-place beam, the positioning sleeve includes a sleeve body, and connecting ribs are welded inside the sleeve body, and the connecting ribs are exposed from the lower end of the sleeve body.

[0015] In the aforementioned connection node between the precast column and the cast-in-place beam, the cast-in-place beam-slab comprises a beam-slab concrete layer, in which column core area stirrups, beam reinforcement and slab reinforcement are provided at the longitudinal exposed reinforcement.

[0016] The construction method of the connection node between the precast column and the cast-in-place beam includes the following steps: S1. Complete the tying of stirrups in the core areas of beams, slabs, and column nodes above the lower precast columns, and expose the longitudinal exposed steel bars above the lower precast columns; S2. Install the longitudinal reinforcement positioning kit of the integrated positioner on the exposed longitudinal reinforcement, and then install the positioning sleeve on the central mounting hole sleeve of the integrated positioner; S3, pour concrete in the core areas of beams, slabs and column joints, and remove the integrated positioner after completion; S4. After the beam and slab strength meets the requirements, the upper precast columns are hoisted, and the steel bar connectors are screwed into the second longitudinal exposed steel bars of the upper precast columns, and the columns are positioned using support sleeves and positioning sleeves. S5. Rotate the steel bar connector to complete the connection between the upper and lower precast column steel bars; S6. Arrange column stirrups connecting column segments; S7. Pour concrete into the connecting column sections to complete the connection of the precast columns.

[0017] Compared with the existing technology, the present invention realizes an integrated solution of "support-positioning-connection" by arranging longitudinal exposed steel bars (with a threaded structure) at one end of the prefabricated column body, a supporting sleeve and a steel bar connector at the other end, and a positioning sleeve on the beam-slab structure. The supporting sleeve and the positioning sleeve are fitted together (with the dual functions of precise positioning and temporary support), and the steel bar connector cooperates with the longitudinal exposed steel bars with a threaded structure.

[0018] Specific technical advantages include: improved construction efficiency: the support sleeve design significantly reduces the number of temporary supports on site, and the standardized connection structure simplifies the installation process, shortening the construction period; quality control: factory prefabrication ensures sleeve positioning accuracy and eliminates the risk of on-site rebar misalignment; and structural performance: the combination of equal-strength rebar connectors and post-cast high-performance concrete improves the shear strength of the joint area. The widespread application of this invention will effectively solve the key technical difficulties currently encountered in precast column connections, and its standardized and modularized features perfectly align with the development trend of building industrialization. It provides reliable technical support for promoting green and intelligent construction, with significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 yes Figure 1 Schematic diagram of the manufacturing process of the structure shown;

[0020] Figure 3 yes Figure 2 Exploded view of; Figure 4 This is a structural view of the steel bar connector embedded in the main body of the precast column; Figure 5 yes Figure 4 A view of the manufacturing process of the structure shown; Figure 6 yes Figure 5 View of the structure after pouring concrete; Figure 7 yes Figure 4 Structural view after omitting the reinforcement connector; Figure 8It is a view of the reinforcement skeleton structure within the cast-in-place beam and slab in the connection node; Figure 9 yes Figure 8 Exploded view of; Figure 10 This is a view of the installation process of installing the positioning sleeve using the integrated positioner; Figure 11 It is a structural view of the integrated locator; Figure 12 It is a structural view of the positioning sleeve; Figure 13 This is the structural view after installing the integrated positioner; Figure 14 This is a structural view after removing the integrated locator; Figure 15 This is a structural view of the upper-level precast columns being hoisted to the top of the beam slab; Figure 16 This is a structural view of the upper and lower precast columns connected by steel bar connectors; Figure 17 It is a structural view of the connection node between precast columns and cast-in-place beams.

[0021] The marks in the accompanying drawings are: 1-precast column body, 2-longitudinal exposed steel bars, 3-support sleeve, 4-steel bar connector, 5-second longitudinal exposed steel bars, 6-mold frame, 7-side cover plate, 8-integrated positioner, 9-longitudinal reinforcement through hole, 10-sleeve mounting hole, 11-precast column, 12-cast-in-place beam and slab, 13-connecting column section, 14-positioning sleeve, 81-installation base plate, 82-center mounting hole sleeve, 83-longitudinal reinforcement positioning kit, 84-casting circulation port, 141-sleeve body, 142-connecting reinforcement, 121-beam and slab concrete layer, 122-column core area reinforcement, 123-beam reinforcement, 124-slab reinforcement. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0023] Example 1. Precast reinforced concrete columns, consisting of Figure 1-7 As shown, it includes a prefabricated column body 1, a group of longitudinal exposed steel bars 2 are provided at one end of the prefabricated column body 1, a support sleeve 3 is provided at the other end of the prefabricated column body 1, and a steel bar connector 4 that matches the longitudinal exposed steel bars 2 is also provided at the other end of the prefabricated column body 1.

[0024] A threaded structure is provided on the top of the longitudinally exposed steel bar 2.

[0025] The support sleeve 3 is located in the middle of the other end of the prefabricated column body 1.

[0026] like Figure 1As shown, the other end of the prefabricated column body 1 is provided with a second longitudinal exposed steel bar 5 with a threaded end, and the thread direction of the threaded structure of the second longitudinal exposed steel bar 5 is opposite to the direction of the threaded structure of the longitudinal exposed steel bar 2, and the second longitudinal exposed steel bar 5 is connected to the steel bar connector 4; Or, as Figure 4 As shown, the rebar connector 4 is embedded in the precast column body 1 and connected to the longitudinal rebar inside the precast column body 1. Here, only a portion of the rebar connector is embedded in the column body. The rebar connector consists of three parts: two sleeves and a connecting rod, one of which is embedded in the precast column.

[0027] The production mold of reinforced concrete precast columns is composed of Figure 2-3 As shown, it includes a mold frame 6 that is through in the length direction, and side cover plates 7 are provided at both ends of the mold frame 6 in the length direction. The top of the mold frame 6 is provided with an opening; the side cover plates 7 are provided with a circle of longitudinal rib through holes 9, and a sleeve mounting hole 10 is provided in the middle of one of the side cover plates 7.

[0028] Also included are integrated locators for locating longitudinal reinforcement and / or support sleeves.

[0029] The integrated positioner 8 includes a mounting base plate 81, a central mounting hole sleeve 82 is provided in the middle of the mounting base plate 81, and a circle of longitudinal reinforcement positioning kits 83 corresponding to the position of the longitudinal exposed steel bars or the second longitudinal exposed steel bars are provided on the surface of the mounting base plate 81; the surface of the mounting base plate 81 is also provided with a casting flow port 84.

[0030] The outer diameter of the center mounting hole sleeve matches the inner diameter of the support sleeve, and the inner diameter of the center mounting hole sleeve matches the outer diameter of the positioning sleeve, so that the support sleeve can be inserted to the outside of the positioning sleeve; or the inner diameter of the center mounting hole sleeve matches the outer diameter of the support sleeve, and the outer diameter of the center mounting hole sleeve matches the inner diameter of the positioning sleeve, so that the support sleeve can be inserted into the positioning sleeve.

[0031] The following prefabricated columns: Taking the prefabricated columns in which the outer diameter of the central mounting hole sleeve matches the inner diameter of the support sleeve, the inner diameter of the central mounting hole sleeve matches the outer diameter of the positioning sleeve, and the second longitudinal exposed steel bar 5 is connected to the steel bar connector 4 as an example; the production steps are as follows: S1, such as Figure 3 As shown, tie the longitudinal steel bars and stirrups, then place them in the mold frame, match the longitudinal reinforcement through-holes of the side cover with the longitudinal steel bars, and then install and fix the side cover; then insert the bottom support sleeve into the outside of the center installation hole sleeve, and then put the integrated locator into the exposed section of the longitudinal steel bar (the second longitudinal exposed steel bar), and then the support sleeve is inserted into the sleeve installation hole to realize the pre-embedding of the support sleeve.

[0032] S2, such as Figure 2 As shown, pour concrete; S3, such as Figure 1 As shown, remove the mold.

[0033] This application has the following advantages: (1) By providing a support sleeve at the bottom of the prefabricated column body, which cooperates with the positioning sleeve installed on the upper surface of the beam plate, this application can serve as a temporary fulcrum during installation, significantly reducing or even eliminating external support frames, reducing construction costs, and improving on-site space utilization. At the same time, the support sleeve of the upper prefabricated column is inserted into the positioning sleeve of the lower layer and fixed. As a way to install the prefabricated column in place, it automatically aligns, which can not only ensure the accurate alignment of the steel bars, but also reduce the time for manual adjustment and improve construction efficiency. It is particularly suitable for high-rise buildings and large-scale prefabricated projects, accelerating the overall construction progress.

[0034] (2) This application is applicable to various cross-sectional forms such as square columns and circular columns, and is suitable for different structural systems such as cast-in-place beams and prefabricated beams. It is convenient for standardized production in factories, has controllable quality, and is easy to promote.

[0035] Example 2. The connection node between the precast column and the cast-in-place beam is formed as follows Figure 8-17 As shown, it includes two prefabricated columns 11 distributed up and down, and a cast-in-place beam slab 12 and a connecting column section 13 are arranged between the two prefabricated columns 11 from bottom to top. The prefabricated columns 11 adopt the reinforced concrete prefabricated columns of this application; the longitudinal exposed steel bars of the prefabricated column 11 located at the bottom pass through the cast-in-place beam slab 12 and are exposed above the cast-in-place beam slab 12, and a positioning sleeve 14 is provided in the middle of the upper surface of the cast-in-place beam slab 12; the steel bar connector at the bottom of the prefabricated column 11 located at the top is connected to the longitudinal exposed steel bars on the prefabricated column 11 below, and the support sleeve is matched with the positioning sleeve 14 (the support sleeve is inserted outside the positioning sleeve); the connecting column section 13 includes a concrete layer, and the concrete layer is provided with column stirrups located at the steel bar connector.

[0036] The positioning sleeve 14 is installed with an integrated positioner 8 for auxiliary installation; the integrated positioner 8 includes a mounting base plate 81, a central mounting hole sleeve 82 is provided in the middle of the mounting base plate 81, and a circle of longitudinal reinforcement positioning kits 83 corresponding to the position of the longitudinal exposed steel bars or the second longitudinal exposed steel bars are provided on the surface of the mounting base plate 81; the surface of the mounting base plate 81 is also provided with a casting flow port 84.

[0037] The positioning sleeve 14 includes a sleeve body 141 , and a circle of connecting ribs 142 is provided at the lower end of the sleeve body 141 .

[0038] The cast-in-place beam and slab 12 includes a beam and slab concrete layer 121 , in which column core reinforcement 122 , beam reinforcement 123 and slab reinforcement 124 are provided at the longitudinal exposed reinforcement.

[0039] The construction method and construction sequence of this embodiment are as follows: 1) The precast columns of this layer are connected with the columns of the lower layer, and the lower floor slab is poured. 2) Complete the tying of stirrups in the core area of ​​beams, slabs and columns on this floor. The reserved steel bars on the upper part of the precast columns pass through the core area of ​​the nodes (i.e. the longitudinal exposed steel bars of the precast columns on this floor are exposed from the floor slab surface on this floor). Figure 8-9 shown.

[0040] 3) If Figure 10-13 As shown, place the positioning sleeve of the prefabricated column, install the integrated positioner, and use the integrated positioner to move the longitudinal exposed steel bars and positioning sleeve (such as Figure 12 (The integrated positioner (as shown) is fixed in position. Figure 11 As shown), it not only locates the steel bars, but also the casing; at the same time, the integrated positioner does not use a whole plate (leaving a pouring flow opening), which facilitates concrete pouring) 4) Pour concrete into the beams, slabs and core areas of the nodes, and remove the integrated positioners (such as Figure 14 shown).

[0041] 5) After the floor slab strength meets the requirements, hoist the upper precast columns, screw the steel bar connectors into the threaded heads of the exposed steel bars at the bottom of the upper precast columns (the second longitudinal exposed steel bars), and use the support sleeves and positioning sleeves to position them (such as Figure 15 shown).

[0042] 6) Turn the steel bar connector to complete the connection between the upper precast column and the precast column reinforcement of this layer (such as Figure 16 shown).

[0043] 7) Arrange column stirrups in the connection section.

[0044] 8) Pour concrete in the connection section to complete the connection of precast columns (such as Figure 17 shown).

[0045] This method simplifies the construction process of prefabricated columns, has clear construction procedures, and eliminates the need for prefabricated columns to be suspended during installation. Using the current method, it is only necessary to position the columns and then use temporary lateral supports to complete the connection of the prefabricated columns.

[0046] This method uses mechanical connection of steel bars to avoid grouting problems of grouting sleeves, better ensures the strength of the upper and lower connection nodes of prefabricated columns, and conforms to the concept of "strong nodes" in structural design.

[0047] This method makes the steel bar positioning of the prefabricated column node more accurate, uses steel bar connectors and positioning sleeves to make the steel bar positioning of the connection section more accurate, and reduces steel bar dislocation and deviation.

[0048] This method can be used for standardized design, and the versatility can be enhanced by designing unified dimensions and specifications of prefabricated columns and standardizing connection methods.

[0049] The present invention proposes a connection node between precast columns and cast-in-place beams, and its construction method, designed to achieve efficient and reliable node connections. The node primarily consists of precast columns, positioning members, connectors, and post-cast concrete. During factory production, the precast columns are pre-reinforced with longitudinal reinforcement at both the upper and lower ends, and the rebar heads are threaded. During on-site installation, a rebar connector connects the bottom rebar of the upper column to the top rebar of the lower column. Post-cast concrete is poured in the column base area, and the connection is completed once the concrete reaches the required curing strength.

[0050] This method can not only greatly improve construction efficiency and shorten construction period, but also ensure the quality of components through standardized factory production and reduce the impact of human factors on site. At the same time, the equal strength connection of the steel connector and the filling of the post-poured high-strength concrete make the column root area with the greatest stress have sufficient strength, rigidity and seismic performance. This method is suitable for the connection of various types of reinforced concrete prefabricated columns and cast-in-place beams. The prefabricated column and concrete beam node and the connection method provided by the present invention have the advantages of high construction efficiency, controllable quality, good node performance, etc., can be widely used in prefabricated buildings, and provide reliable technical support for promoting the development of building industrialization.

Claims

1. Precast reinforced concrete columns, characterized by: The prefabricated column body (1) comprises a prefabricated column body (1), wherein one end of the prefabricated column body (1) is provided with a group of longitudinal exposed steel bars (2), the other end of the prefabricated column body (1) is provided with a support sleeve (3), and the other end of the prefabricated column body (1) is further provided with a steel bar connector (4) that matches the longitudinal exposed steel bars (2).

2. The reinforced concrete prefabricated column according to claim 1, characterized in that: A threaded structure is provided on the top of the longitudinally exposed steel bar (2).

3. The reinforced concrete prefabricated column according to claim 1, characterized in that: The supporting sleeve (3) is located in the middle of the other end of the prefabricated column body (1).

4. The reinforced concrete prefabricated column according to claim 1, characterized in that: The other end of the prefabricated column body (1) is provided with a second longitudinal exposed steel bar (5) having an end portion in a threaded structure, and the thread direction of the threaded structure of the second longitudinal exposed steel bar (5) is opposite to the direction of the threaded structure of the longitudinal exposed steel bar (2), and the second longitudinal exposed steel bar (5) is connected to a steel bar connector (4); or, the steel bar connector (4) is pre-buried in the prefabricated column body (1) and connected to the longitudinal steel bar located inside the prefabricated column body (1).

5. A connection node between a prefabricated column and a cast-in-situ beam, comprising two prefabricated columns (11) arranged vertically, a cast-in-situ beam plate (12) and a connecting column section (13) being arranged between the two prefabricated columns (11) from bottom to top, characterized in that: The precast column (11) is a reinforced concrete precast column according to any one of claims 1 to 4; the exposed longitudinal steel bars of the precast column (11) located below pass through the cast-in-place beam slab (12) and are exposed above the cast-in-place beam slab (12), and a positioning sleeve (14) is provided in the middle of the upper surface of the cast-in-place beam slab (12); the steel bar connector at the bottom of the precast column (11) located above is connected to the exposed longitudinal steel bars on the precast column (11) below, and the supporting sleeve is fitted with the positioning sleeve (14); the connecting column section (13) includes a concrete layer, and column stirrups are provided in the concrete layer at the steel bar connector.

6. The connection node between a prefabricated column and a cast-in-place beam according to claim 5, characterized in that: The positioning sleeve (14) is installed with an integrated positioner (8) for auxiliary installation; the integrated positioner (8) comprises a mounting base plate (81), a central mounting hole sleeve (82) is provided in the middle of the mounting base plate (81), and a longitudinal reinforcement positioning kit (83) corresponding to the position of the longitudinal exposed steel bar or the second longitudinal exposed steel bar is also provided on the surface of the mounting base plate (81); the surface of the mounting base plate (81) is also provided with a pouring flow opening (84).

7. The connection node between a prefabricated column and a cast-in-place beam according to claim 5, characterized in that: The positioning sleeve (14) comprises a sleeve body (141), a connecting rib (142) is welded inside the sleeve body (141), and the connecting rib (142) is exposed from the lower end of the sleeve body (141).

8. The connection node between a prefabricated column and a cast-in-place beam according to claim 5, characterized in that: The cast-in-place beam and slab (12) comprises a beam and slab concrete layer (121), wherein the beam and slab concrete layer (121) is provided with column core region stirrups (122) located at longitudinal exposed steel bars, beam steel bars (123), and slab steel bars (124).

9. The construction method for the connection node between a prefabricated column and a cast-in-situ beam according to any one of claims 5 to 8, characterized in that: The following steps are involved: S1. Complete the tying of stirrups in the core areas of beams, slabs, and column nodes above the lower precast columns, and expose the longitudinal exposed steel bars above the lower precast columns; S2. Install the longitudinal reinforcement positioning kit of the integrated positioner on the exposed longitudinal reinforcement, and then install the positioning sleeve on the central mounting hole sleeve of the integrated positioner; S3, pour concrete in the core areas of beams, slabs and column joints, and remove the integrated positioner after completion; S4. After the beam and slab strength meets the requirements, the upper precast columns are hoisted, and the steel bar connectors are screwed into the second longitudinal exposed steel bars of the upper precast columns. The positioning sleeves are plugged into the support sleeves to complete the positioning. S5. Rotate the steel bar connector to complete the connection between the upper and lower precast column steel bars; S6. Arrange column stirrups connecting column segments; S7. Pour concrete into the connecting column sections to complete the connection of the precast columns.

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